Printer mechanism with variable printing force - uses intermediate plate selectively inserted between spring plate and lever

摘要

The printer mechanism has a frame supporting a printing roller (1) and a printing head (2) attached to a support (7). The printing force between the printing head and the printing roller is provided by at least one coil spring (12) between the support and a spring plate (14), secured to the frame via a lever (15). The variation in the printing force is obtained by inserting an intermediate plate (17) between the spring plate and the lever. Pref. the intermediate plate is secured to the spring plate for sliding parallel to the printing roller.